--- Comment #14 from Heiko Tietze <[hidden email]> ---
You tell the user that Insert > File > (png) cannot converted to text ("File
can't be converted to text"). This sounds a bit weird to me as I wouldn't
expect such function. How about something like "Only odt, doc, txt files can be
inserted". And since the command is now "Insert text from file..." a simple
"This is not a text document" might also work.
Btw, loading a PDF returns "Read error\nError reading file.", which is
tech-talk. Either loading PDF as text is possible (and the actual reason is
given why it fails) or the error message above applies as well.